12 volt inverter

huh?

Are you looking for a 12v DC power source to run circuits? One that plugs into a standard 110vAC outlet and steps down to 12vDC?

If so simply search for "12v DC Power Supply"

Are you looking for a power inverter so that you can run 110vAC appliances in your vehicle via a cigarette lighter?

If so, simply search for "Power Inverter"

To be fair, you did not ask a question.